900p only has roughly 56% more pixels than 720p, and the Eurogamer rumour stated a 150% GPU power increase when docked. (It was worded saying undocked has 40% of the GPU power compared to docked.) There could be a few explanations for this. It could be that other graphics settings are increased when docked, (such as shadow quality for example,) or maybe they decided for some reason not to use the full GPU horsepower for the title when docked. Could the docked version possibly be oversampled, or undocked be upscaled? If none of these things seem to be the case, than something about the hardware rumour is off.